



April 7, 1964 C. D. MCCANN ETAL 3,127,844

PUMP

Filed June 15, 1961 livr/v5.51? 5l! #0MM 63 TMF/.96' 177/ .5'

United States Patent O 3,127,844 PUF/H Clyde D. Meann, 3323 E. 13th St., and Immanuel Steitz, 516 E.. Sheridan, both of Des Moines, Iowa Filed .lune 15, 1961, Ser. No. 117,398 i Claims. (rCi. 1li3-137) rl'his invention relates to pumps and more particularly to a pump of the rotary type.

Pumps in general are of an old art. However, most pumps are not eiiicient, are not self priming and require a relatively long time to reach given maximum pressures. Another objection is that they do build up undesirable back pressures. Still further objections are that they do not hold a uniform maximum pressure and must be relatively bulky and heavy to produce large volume fluid flow.

Therefore, one of the objects or" our invention is to provide a relative small highly eicient rotary pump.

A further object of this invention is to provide a pump that will automatically prime itself.

A still further object of this invention is to provide a pump that will quickly reach its maximum pressure and when once reached will maintain such maximum pressure without iiuctuation.

A still further object of this invention is to provide a pump that is smooth in operation and without undesirable vibration.

A still further object of this invention is to provide a pump with very little if any back pressure.

A still further object of this invention is to provide a pump of the rotary type that exerts a uniform yielding pressure on the outward radially sliding action of the rotor blades regardless of the position of rotation of the rotor.

Still further objects of our invention are to provide a pump that is economical in manufacture and durable in use.

These and other objects will be apparent to those skilled in the art.

Our invention consists in the construction, arrangements, and combination, of the various parts of the device, whereby the objects contemplated are attained as hereinafter more fully set forth, speciiically pointed out in our claims, and illustrated in the accompanying drawing, in which:

FIG. 1 is a side view of our pump,

FIG. 2 is a cross-sectional view of the pump taken on line 2 2 of HG. 1,

FIG. 3 is an enlarged longitudinal sectional view of the pump taken on line 3 3 of FG. 2, and

FIG. 4 is an enlarged exploded perspective view of the rotor unit portion of the pump.

Referring to these drawings, we have used the numeral to generally designate the pump housing having a cylindrical cavity 11 and a detachable face plate 12.

Rotatably extending into the housing lil is the drive shaft 13. This shaft is adapted to be operatively connected to a prime mover (not shown). On the inner end of the shaft is a bearing wheel 14 rotatably mounted in a recess 15 of the housing 1t?, and which communicates with the cavity 11, as shown in FlG. 3.

Mounted on the face of the bearing wheel is the circular pump rotor 16. This mounted rotor 16 revolves in the cavity 11 of the housing and progressively approaches and progressively moves away from all points of the circular wall of the cavity 11 as it is rotated by the drive shaft 13. The reason for this is that the shaft 13, recess 15, bearing wheel 1d and rotor 16 are all in concentric relationship with each other, but all are in eccentric relationship to the cylindrical wall of the cavity 11. Straight across the rotor is a slot 17, cutting the rotor into two equal parts as shown in FG. 4.

Extending into one side of the housing is the intake conduit 19 having its port opening 20 communicating with the inner side of the cavity 11.

Extending into the other side of the housing is the exhaust conduit 21 having its port opening 22 communicating with the other side of the cavity 11. The two conduits 19 and 21 may extend at any angle relative to each other but their port openings 20 and 22, must face each other and be opposite from each other and in a plane coinciding with a darnetrical plane extending through the rotor 16, as shown in FIG. 2. Thus, a line intersecting the centers of port openings 20 and 22 will lie above a parallel line extending along the diameter of the cavity 11. The parts are so arranged, that when the rotor slot 17 is in a horizontal position, it will have one end adjacent the port opening 20 and its other end adjacent the port opening 22. Also, the rotor will be closely adjacent either the inside top of the cavity 11, or will be closely adjacent the inside bottom of the cavity 11.

The port openings 20 and 22 are of the same capacity area and are each of a cross area greater than that of the cross area of the slot 17. Slidably loosely mounted irl one end area of the slot 17 is a blade 23. Slidably loosely mounted in the other end area of the slot 17 is a blade 25. These two blades 23 and 25 are each of a cross sectional area, less than that of the cross sectional area of the slot 17 in order that a small amount of fluid can pass by them and through the longitudinal length of the slot 17. The numeral 26 designates a coil spring in the slot 17, having one end yieldingly engaging the blade 23 and its other end yieldingly engaging the blade 25. Thus both blades will be yieldingly held outwardly into sliding contact with the inside circular wall of the cavity 11. However, and inasmuch as one blade will be moving outwardly in the slot 17 as the other blade moves inwardly in the slot, and vice versa, when the rotor is rotated, the yielding action on the blades will always be uniform, egardless of the position of rotation of the rotor or positions of the blade in the rotor. The two blades are duplicates, and each of their cross sectional areas are less than the cross sectional areas of each of the port openings.

Therefore, when the device is rotating, and for the fraction of an instant, when the slot 17 is horizontal, Huid may bleed7 back from the outlet port opening 22, past the blade 23, into the slot 17, past the blade 25 and to the inlet port opening. Obviously, this occurs at each one hundred eighty degrees of rotation of the rotor. This momentary bypass of pressure tends to neutralize pressures at intake and outlet passageways and therefore stabilizes the maximum pressure at point of use and without iiuctuation. It makes for a smooth even running pump, and a desirable uniform power demand from the motor. In fact, there will be no power loss due to back pressures. Even when the blade 23 has passed the port 22` and moved upwardly, and the blade 25 has passed the port 2l), the restricted area forward of the blade 23 will be in partial communication with the relatively large area forward of the blade 25. Therefore, at all times there will be no material tendency for the pump to compress the fluid being pumped. Another feature of our pump construction is that it may be reversed merely by changing the direction of rotation of the rotor.

Some changes may be made in the construction and arrangement of our pump without departing from the real spirit and purpose of our invention, and it is our intention to cover by our claims, any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope.

We claim:

l. In a pump, comprising, in combination,

a housing having a cavity with a cylindrical wall,

a shaft rotatably mounted on said housing,

a circular rotor operatively secured to said shaft and in said cavity; said cylindrical wall of said cavity being eccentric in relation to said circular rotor,

an inlet passageway in said housing communicating with the inside cavity of said housing,

an outlet passageway in said housing communicating with the inside cavity of said housing; said point where said outlet passageway communicates with the inside of said cavity being `a-t a point opposite from the point where said inlet passageway communicates with said cavity,

a blade slidably mounted on said rotor and engaging the cylindrical wall of said cavity,

`and a second blade slidably mounted on said rotor and engaging the cylindrical Wall of Isaid cavity at a po1nt `opposite from the point of engagement where said tirs-t bladeengages the cylindrical wall of said cavity; said blades each having `a thickness less than that of the width of either said inlet passage-way or said outlet passageway; and a passage-way in said rotor extending from said iirst blade to said second blade whereby when said two blades `are in direct line communication with said two passageways, respectively, said two passageways will have limited communication past said blades and with each other.

2. -In a pump, comprising, in combination,

a housing having a cavity with a cylindrical wall,

a shaft rotatably mounted on said housing,

a circular rotor operatively secured to said shaft and in said cavity; said lcylindrical wall of said cavity being eccentric in relation to said circular rotor,

an inlet passageway in isaid housing communicating with the inside cavity of said housing,

an outlet passageway in said housing communicating with the inside cavity of said housing; said poin-t where said outlet passageway communicates with the inside of said cavity being at a point opposite `from the point where said inlet passageway communicates with said cavity,

a groove extending diametrically across and in said rotor,

a `blade slidably mounted in o ne end area of said groove engaging the cylindrical wall of said cavity,

and a second blade slidably mounted in the other end area of said groove engaging the cylindrical wall of said cavity; said two blades each having a thickness substantially less than that of the width of said groove and less than that o-f either said inlet passageway or said outlet passageway, whereby :when said two blades are in direct line communication with said two passageways, respectively, said two passageways will have limited communication past said blades, through said groove and with each other.

3. In a pump, comprising, in combination,

a-housing having a cavi-ty with a cylindrical wall,

a shaft rotatably mounted on said housing,

a circular rotor operatively secured to said shaft and in said cavity; said cylindrical wall of said cavity being eccentric in relation to said circular rotor,

an inlet passagewayy in said housing communicating with the inside cavity of said housing,

an outlet passageway in said housing communicating with the inside cavity of said housing; said point where said outlet passageway communicates with the inside of said cavity being at a point opposite from the point where said inlet passageway communicates with said cavity,

a groove extending diametrically across and in said rotor,

a blade slidably mounted in one end area of said groove engaging the cylindrical'wail of said cavity,

`a second blade slidably mounted in the other end area of said groove engaging the cylindrical wall of said cavity; said two blades each having a thickness substantially less than that of the width of said groove and less than that of either said inlet passageway or said outlet passageway, whereby when said two blades are in direct line communication Vwith said two passageways, respectively, said t-wo passage-ways will have limited communication past said blades, through said groove and with each other,

and a coil spring in said groove and between said two biades for yieldingly holding said blades away from each other and in yielding contact with the cylindrical wall of said cavity.

4. In a pump, comprising, in combination,

a housing having a cavity with a cylindrical wall,

a shaft rotatably mounted on said housing,

a circular rotor operatively secured to said shaft and in said cavity; said cylindrical wall of said cavity being eccentric in relation to said circular rotor,

an inlet passageway in said housing communicating with the inside cavity of said housing,

an outlet passageway in said housing communicating with the inside cavity of said housing; said point where said outlet passageway communicates with the inside of said cavity being at a point opposite from the point where said inlet passageway communicates with said cavity,

a groove extending diarnetrically across and in said rotor,

a blade slidably mounted in one end area of said groove engaging the cylindrical wall of said cavity,

a second blade slidably mounted in the other end area of said groove engaging the cylindrical wall of said cavity; said two blades each having a thickness substantially less than that of the width of said groove and less than that of either said inlet passageway or said outlet passageway, whereby when said two blades are in direct line communication with said two passageways, respectively, said two passageways will have limited communication past said blades, through said groove and with each other.

and a coil spring in said groove and between said two blades for yieldingly holding said blades away from each other and in yielding contact with the cylindrical wall of said cavity; said circular rotor consisting of a circular bearing wheel portion rotatably mounted in said housing and a circular head portion in said cavity with said groove in the said circular head portion.

References Cited in the le of this patent UNITED STATES PATENTS 940,056 Pocock Nov. 16, 1909 1,339,347 Jackson May 4, 1920 2,334,763 Hawkins Nov. 23, 1943 2,358,226 Hagstrom Sept. 12, 1944 2,782,725 Hojberg Feb. 26, 1957 2,814,255 Lorenzetti Nov. 26, 1957 2,974,700 Waters Mar. 14, 1961 FOREIGN PATENTS 12,790 Great Britain of 1884 23,153 Great Britain of 1906 326,180 Great Britain Feb. 28, 1930 

1. IN A PUMP, COMPRISING, IN COMBINATION, A HOUSING HAVING A CAVITY WITH A CYLINDRICAL WALL, A SHAFT ROTATABLY MOUNTED ON SAID HOUSING, A CIRCULAR ROTOR OPERATIVELY SECURED TO SAID SHAFT AND IN SAID CAVITY; SAID CYLINDRICAL WALL OF SAID CAVITY BEING ECCENTRIC IN RELATION TO SAID CIRCULAR ROTOR, AN INLET PASSAGEWAY IN SAID HOUSING COMMUNICATING WITH THE INSIDE CAVITY OF SAID HOUSING, AN OUTLET PASSAGEWAY IN SAID HOUSING COMMUNICATING WITH THE INSIDE CAVITY OF SAID HOUSING; SAID POINT WHERE SAID OUTLET PASSAGEWAY COMMUNICATES WITH THE INSIDE OF SAID CAVITY BEING AT A POINT OPPOSITE FROM THE POINT WHERE SAID INLET PASSAGEWAY COMMUNICATES WITH SAID CAVITY, A BLADE SLIDABLY MOUNTED ON SAID ROTOR AND ENGAGING THE CYLINDRICAL WALL OF SAID CAVITY, AND A SECOND BLADE SLIDABLY MOUNTED ON SAID ROTOR AND ENGAGING THE CYLINDRICAL WALL OF SAID CAVITY AT A POINT OPPOSITE FROM THE POINT OF ENGAGEMENT WHERE SAID FIRST BLADE ENGAGES THE CYLINDRICAL WALL OF SAID CAVITY; SAID BLADES EACH HAVING A THICKNESS LESS THAN THAT OF THE WIDTH OF EITHER SAID INLET PASSAGEWAY OR SAID OUTLET PASSAGEWAY; AND A PASSAGEWAY IN SAID ROTOR EXTENDING FROM SAID FIRST BLADE TO SAID SECOND BLADE WHEREBY WHEN SAID TWO BLADES ARE IN DIRECT LINE COMMUNICATION WITH SAID TWO PASSAGEWAYS, RESPECTIVELY, SAID TWO PASSAGEWAYS WILL HAVE LIMITED COMMUNICATION PAST SAID BLADES AND WITH EACH OTHER. 